instructor

Meanings

1. 1
   noun

   One who instructs; a teacher.

   According to the National Centre for Education Statistics' most recent numbers (2012), 50% of instructors at degree-granting institutions in the US are part-time. […] Through teaching as an adjunct instructor while still a graduate student, I've had the luxury of developing my career: testing out teaching strategies, exploring innovative courses, and developing relationships with students – all while working on my dissertation.

2. 2
   noun

   a person whose occupation is teaching

Etymology

From Latin instructor, equivalent to instruct + -or.